My situation was similar. My understanding is that not all Yanmars are affected this way. As someone else mentioned, having the valves checked and...
Sorry to hear of your gearbox issue. Not sure if it is directly related to the valve issue that I have but who knows. I am currently waiting for a...
Thanks very much for the quick update. I will be in touch again in a couple of weeks. I will keep you posted on developments on my end as well.
Same Problem I have just experienced the exact same problem with a Yanmar 6LY2A STP 440 engine. Two valves ceased most likely due to a piece of...